When we were there, Bowman Bay was open but the rates were reduced because there was no plumbing (ie just cold water taps and outhouses - apparently that's what some people consider 'roughing it'). Not sure if they're closed completely now, but some of our group camped somewhere else, over the bridge. They're not wilderness sites, this is all 'car camping'. I didn't see anywhere very accessible to launch from near Anacortes, but with a bit of time and 2+ people you might be able to make something work. Unfortunately, the schedules weren't conducive to paddling to/from there (ie early morning departure from Anacortes, with only one sailing per day). At Bowman, the water was very sheltered from any winds in the strait and the campsites were very water-accessible. Even if you had one of the higher sites, you could easily walk the boat down to the water and launch sans car.